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Good day.
If you can identify those shorted transistors and you can remove them, you can actually order them from Samsung through this links http://electronicsmarket.com.au. It has everything Samsung, you will not be disappointed. Click on the link, click on Plasma TV's, then click on PS50C430, then (again) click on the version you may have and a list of possible parts will appear for this model. I didn't go through the long list (5 pages), but I believe what you're looking for is there. If not, you can contact them Website and ask not only for the transistors but you can actually get further help with your query.
Hope it helps. Cheers

This is very normal. There is a joke out that Plasma screens are an excellent source of heat in the winter. Yes this is the very reason they started making LCD screens they dont heat up like plasma screens. Keep in mind your plasma screen has a gas in it that is ignited or lit by very high voltage. The only thing to do would be to sale theTV and replace it with the same size LCD screen TV. If you need to know the diffrence from a plasma screen and a LCD. The Plasma TV has a hard glass surface when you touch it. An LCD has a soft plastic screen like the one on your laptop computer. Never Touch a Plasma TV when its on.